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Consider a compound slab consisting of t...

Consider a compound slab consisting of two different material having equal thickness and thermal conductivities `K` and `2K` respectively. The equivalent thermal conductivity of the slab is

A

`3 K`

B

`(4)/(3) K`

C

`(2)/(3) K`

D

`sqrt2 K`

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The correct Answer is:
b
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